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Post by bawbag on Nov 12, 2020 19:35:59 GMT
Are the CDI's interchangeable between the 250 and 400 models please?
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Post by buster on Nov 12, 2020 21:08:58 GMT
in theory no, some people have done it and the bikes run ok, problem is the 400 has a higher current output from the stator so it could likely fry a 250 cdi. also I'd guess that the two bikes have different ignition advance curves (short stroke on the 250, longer stroke on the 400 and slighter lumpier cam). possibly it might be ok to put a 400 cdi on a 250?
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Post by bawbag on Nov 14, 2020 18:27:49 GMT
Thanks Buster.
I have now managed to obtain the correct version from a friend of a friend but this is great to know.
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Post by Chris P Duck on Nov 14, 2020 18:39:45 GMT
The CDI system used on this bike engine is a self contained system and is not battery dependant except for the engines starter motor. The same system is used on kick start engines, so must be good, relying on relatively slow engine speed when being kick started.
The system consists of a flywheel generator to provide the power or energy for the system to work, a CDI unit providing a relatively high energy "pulse" to the HT coil, which provides the high tension high voltage "spark" produced at the spark plug. It has a "kill" circuit via the main ignition switch as well as a handlebar mounted kill switch. The system has an inbuilt "ignition advance". The system requires no maintenance as it has no major "moving and wearing" parts needing replacement and servicing.
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